A kind of swirl shaft flood discharge tunnel with vortex chamber aeration sill

Abstract

The invention provides a swirl shaft flood discharging tunnel with a volute chamber aerator. A side wall originally connected with a volute chamber shifts towards the center side of the volute chamberby a distance, and therefore the vertical aerator is formed in the volute chamber. When water flow passes through a step-down floor, an aerated cavity is formed, external air continuously carries outneeded gas supply on the water flow close to the wall side through the cavity, the aerated concentration of the water flow close to the wall is increased, and therefore the cavitation and cavitationerosion resistance of a whole shaft structure is greatly improved. Meanwhile, the aerated structure is far simpler than a conventional shaft aerator, and the engineering design difficulty and engineering cost can be greatly reduced. In addition, a fold line structure of the aerator replaces an original smoothly tangent structure, the engineering construction difficulty is greatly reduced, and thecavitation erosion and cavitation resistance of the connected position of the aerator and the shaft structure is improved.

Description

technical field [0001] The invention belongs to the field of flood discharge and energy dissipation in water conservancy and hydropower projects, and in particular relates to a novel swirl shaft flood discharge tunnel with vortex chamber aeration sills. Background technique [0002] The swirling shaft flood discharge tunnel has attracted more and more attention from the field of water conservancy and hydropower engineering because of its advantages such as low difficulty in construction, flexible layout, and outstanding energy dissipation effect. Especially as my country is currently in the stage of blowout development of hydropower construction, many high dams and large reservoirs with high water head, large flow, and deep canyons are under construction or are in the planning stage. Conventional drainage structures cannot well realize flood discharge. In the case of energy, the swirl shaft is a good choice as a newly developed flood discharge and energy dissipation building....

AI Technical Summary

Problems solved by technology

[0004] However, due to the gradual increase in the height of the current shaft, the risk of cavitation and cavitation on the shaft wall is gradually increasing. Some shafts with high flow rates need to install separate aeration facilities at appropriate positions in the shaft to ensure the cavitation resistance of the shaft wall. , and the construction of a separate aeration facility greatly increases the project cost, and the existing aeration structures are relatively complex, which will undoubtedly increase the difficulty of constructing the shaft structure; The connection part of the cylindrical vortex chamber needs to be kept completely tangent, otherwise the wall surface will be uneven to form an artificial convex body and become a source of cavitation, which puts forward very high requirements for construction accuracy

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